Ambio executive desk chair, from RH, Sweden, comes in three back heights - medium, high, and high with head rest.
Seat depth is available in medium and large, and arm rests are height adjustable. The knee-tilt mechanism allows variable posture between forward and reclining, while the basic settings always remain constant.

The seat and back cushions are made from Ventec, which is predominantly horsehair, a fibre which breathes effectively. RH offer wool upholstery which has excellent ventilation and moisture-absorbing properties.
This allows Ventec to work to the best of its abilities.